Err and Eu

Err- to stray or wander

Eu- Well or good

Erratic (adj.)- having no fixed course

Errant (adj.)- deviating from the proper coarse

Erratum (n.)- an error in printing or writing

Eulogize (v.)- to praise highly in speech or writing

Euphemism (n.)- a mild indirect word or expression

Euphony (n.)- pleasing to the ear